fix: 去除openai-apkey账户请求路径多余的v1

backend/internal/service/openai_gateway_service.go

@@ -371,7 +371,7 @@ func (s *OpenAIGatewayService) buildUpstreamRequest(ctx context.Context, c *gin.
 		// API Key accounts use Platform API or custom base URL
 		baseURL := account.GetOpenAIBaseURL()
 		if baseURL != "" {
-			targetURL = baseURL + "/v1/responses"
+			targetURL = baseURL + "/responses"
 		} else {
 			targetURL = openaiPlatformAPIURL
 		}